Acquisitions (Details) $ in Thousands	6 Months Ended
	Jul. 02, 2017 USD ($) Restaurant	Jul. 03, 2016 USD ($) Restaurant	Jan. 01, 2017 USD ($)
Identifiable assets acquired and liabilities assumed:
Goodwill	$ 742,407		$ 741,410
Acquisitions [Member]
Business Acquisition [Line Items]
Restaurants acquired from franchisees | Restaurant	0	2
Total consideration paid, net of cash received	$ 0	$ 2,209
Identifiable assets acquired and liabilities assumed:
Properties	0	2,218
Deferred taxes and other assets	0	9
Other liabilities	0	(18)
Total identifiable net assets	0	2,209
Goodwill	$ 0	$ 0